﻿// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

namespace System.Windows.Forms;

/// <summary>
///  Represents a command link button control of a task dialog.
/// </summary>
public sealed class TaskDialogCommandLinkButton : TaskDialogButton
{
    private string? _descriptionText;

    /// <summary>
    ///  Initializes a new instance of the <see cref="TaskDialogButton"/> class.
    /// </summary>
    public TaskDialogCommandLinkButton()
    {
    }

    /// <summary>
    ///  Initializes a new instance of the <see cref="TaskDialogButton"/> class
    ///  using the given text and, optionally, a description text.
    /// </summary>
    /// <param name="text">The text of the control.</param>
    /// <param name="descriptionText">
    ///  An additional description text that will be displayed in a separate line when the <see cref="TaskDialogButton"/>s
    ///  of the task dialog are shown as command links (see <see cref="DescriptionText"/>).
    /// </param>
    /// <param name="enabled">A value that indicates if the button should be enabled.</param>
    /// <param name="allowCloseDialog">
    ///  A value that indicates whether the task dialog should close when this button is clicked.
    /// </param>
    public TaskDialogCommandLinkButton(
        string? text,
        string? descriptionText = null,
        bool enabled = true,
        bool allowCloseDialog = true)
        : base(text, enabled, allowCloseDialog)
    {
        _descriptionText = descriptionText;
    }

    /// <summary>
    ///  Gets or sets an additional description text that will be displayed in a separate
    ///  line.
    /// </summary>
    /// <exception cref="InvalidOperationException">
    ///  The property is set and this button instance is currently bound to a task dialog.
    /// </exception>
    public string? DescriptionText
    {
        get => _descriptionText;
        set
        {
            DenyIfBound();

            _descriptionText = value;
        }
    }

    internal override string? GetResultingText()
    {
        string? text = base.GetResultingText();

        if (text is not null && _descriptionText is not null)
        {
            text += '\n' + _descriptionText;
        }

        return text;
    }
}
